package com.yz.filter;

import com.alibaba.fastjson.JSON;
import com.yz.common.BaseContext;
import com.yz.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1，获取本次请求的URI
        String requestURI = request.getRequestURI();

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //2、判断本次请求是否需要处理
        boolean check = check(urls,requestURI);

        //3、如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4、如果 (管理员) 未登录则直接返回未登录结果，通过输出流方式想客户端页面响应数据
        if(request.getSession().getAttribute("employee")!=null){
            Long id = (Long) request.getSession().getAttribute("employee");
            log.info("用户已登录，用户id为：{}",id);
            // 在线程缓存中 添加当前用户的id
            BaseContext.setCurrentId(id);
            filterChain.doFilter(request,response);
            return;
        }

        //4、如果 (用户) 未登录则直接返回未登录结果，通过输出流方式想客户端页面响应数据
        if(request.getSession().getAttribute("user")!=null){
            Long id = (Long) request.getSession().getAttribute("user");
            log.info("用户已登录，用户id为：{}",id);
            // 在线程缓存中 添加当前用户的id
            BaseContext.setCurrentId(id);
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检测本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for(String url:urls){
            boolean match = PATH_MATCHER.match(url,requestURI);
            if(match)
                return true;
        }
        return false;
    }
}
